CVE-2020-8905 Information

Description

A buffer length validation vulnerability in Asylo versions prior to 0.6.0 allows an attacker to read data they should not have access to. The ’enc_untrusted_recvfrom’ function generates a return value which is deserialized by ‘MessageReader’ and copied into three different ’extents’. The length of the third ’extents’ is controlled by the outside world and not verified on copy allowing the attacker to force Asylo to copy trusted memory data into an untrusted buffer of significantly small length.. We recommend updating Asylo to version 0.6.0 or later.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5